Yes. I will export to CSV and in LibreOffice i will change all productchild for column "custom_disabler" from "Y" to "N". After importing this changes, everything should be turned off. This component is not cheap, but I think I have no choice but to buy it. It will be useful for the future ;-)

I have 112 positions of custom fields and 1730 products with this fields. In db table "virtuemart_product_customfields" in column "disabler" i have 39000 positions for different numbers of options from fields or if this no checked this is number 0...

list in child product in tab with parameters from custom fields should have "select all" checkbox. It would be faster...

I understand, but I did not want to delete all custom fields in child products - just duplicates. Children's products have their own custom fields that differ from the parent's products. They display double. The child product displays its custom field and same the parent product field - this is an bug. By default, the child should replace the parent.I removed duplicates using CSVI. I replaced custom field values from the parent product with a child product. :-)